Hello I have a Hino 338 I am working rear lights on truck. Truck came to me with no brake lights. I fixed that problem. Now I am working on trailer wiring. There is a 7 way trailer plug at back of the truck the trailer wire runs up the passenger side frame rail and comes to the back of the cab. There is no plug there to plug it into. Hoping someone on here can tell me where the trailer wiring comes from on the truck?
